/**
 * TrimPath Template. Release 1.0.38.
 * Copyright (C) 2004, 2005 Metaha.
 *
 * TrimPath Template is licensed under the GNU General Public License
 * and the Apache License, Version 2.0, as follows:
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed WITHOUT ANY WARRANTY; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
var TrimPath;

// TODO: Debugging mode vs stop-on-error mode - runtime flag.
// TODO: Handle || (or) characters and backslashes.
// TODO: Add more modifiers.

(function() {			   // Using a closure to keep global namespace clean.
	if (TrimPath == null)
		TrimPath = new Object();
	if (TrimPath.evalEx == null)
		TrimPath.evalEx = function(src) {
			return eval(src);
		};

	var UNDEFINED;
	if (Array.prototype.pop == null)  // IE 5.x fix from Igor Poteryaev.
		Array.prototype.pop = function() {
			if (this.length === 0) {
				return UNDEFINED;
			}
			return this[--this.length];
		};
	if (Array.prototype.push == null) // IE 5.x fix from Igor Poteryaev.
		Array.prototype.push = function() {
			for (var i = 0; i < arguments.length; ++i) {
				this[this.length] = arguments[i];
			}
			return this.length;
		};

	TrimPath.parseTemplate = function(tmplContent, optTmplName, optEtc) {
		if (optEtc == null)
			optEtc = TrimPath.parseTemplate_etc;
		var funcSrc = parse(tmplContent, optTmplName, optEtc);
		var func = TrimPath.evalEx(funcSrc, optTmplName, 1);
		if (func != null)
			return new optEtc.Template(optTmplName, tmplContent, funcSrc, func, optEtc);
		return null;
	}

	try {
		String.prototype.process = function(context, optFlags) {
			var template = TrimPath.parseTemplate(this, null);
			if (template != null)
				return template.process(context, optFlags);
			return this;
		}
	} catch (e) { // Swallow exception, such as when String.prototype is sealed.
	}

	TrimPath.parseTemplate_etc = {};            // Exposed for extensibility.
	TrimPath.parseTemplate_etc.statementTag = "forelse|for|if|elseif|else|var|macro";
	TrimPath.parseTemplate_etc.statementDef = { // Lookup table for statement tags.
		"if"	 : { delta:  1, prefix: "if (", suffix: ") {", paramMin: 1 },
		"else"   : { delta:  0, prefix: "} else {" },
		"elseif" : { delta:  0, prefix: "} else if (", suffix: ") {", paramDefault: "true" },
		"/if"	: { delta: -1, prefix: "}" },
		"for"	: { delta:  1, paramMin: 3,
			prefixFunc : function(stmtParts, state, tmplName, etc) {
				if (stmtParts[2] != "in")
					throw new etc.ParseError(tmplName, state.line, "bad for loop statement: " + stmtParts.join(' '));
				var iterVar = stmtParts[1];
				var listVar = "__LIST__" + iterVar;
				return [ "var ", listVar, " = ", stmtParts[3], ";",
					// Fix from Ross Shaull for hash looping, make sure that we have an array of loop lengths to treat like a stack.
						 "var __LENGTH_STACK__;",
						 "if (typeof(__LENGTH_STACK__) == 'undefined' || !__LENGTH_STACK__.length) __LENGTH_STACK__ = new Array();",
						 "__LENGTH_STACK__[__LENGTH_STACK__.length] = 0;", // Push a new for-loop onto the stack of loop lengths.
						 "if ((", listVar, ") != null) { ",
						 "var ", iterVar, "_ct = 0;",	   // iterVar_ct variable, added by B. Bittman
						 "for (var ", iterVar, "_index in ", listVar, ") { ",
						 iterVar, "_ct++;",
						 "if (typeof(", listVar, "[", iterVar, "_index]) == 'function') {continue;}", // IE 5.x fix from Igor Poteryaev.
						 "__LENGTH_STACK__[__LENGTH_STACK__.length - 1]++;",
						 "var ", iterVar, " = ", listVar, "[", iterVar, "_index];" ].join("");
			} },
		"forelse" : { delta:  0, prefix: "} } if (__LENGTH_STACK__[__LENGTH_STACK__.length - 1] == 0) { if (", suffix: ") {", paramDefault: "true" },
		"/for"	: { delta: -1, prefix: "} }; delete __LENGTH_STACK__[__LENGTH_STACK__.length - 1];" }, // Remove the just-finished for-loop from the stack of loop lengths.
		"var"	 : { delta:  0, prefix: "var ", suffix: ";" },
		"macro"   : { delta:  1,
			prefixFunc : function(stmtParts, state, tmplName, etc) {
				var macroName = stmtParts[1].split('(')[0];
				return [ "var ", macroName, " = function",
						 stmtParts.slice(1).join(' ').substring(macroName.length),
						 "{ var _OUT_arr = []; var _OUT = { write: function(m) { if (m) _OUT_arr.push(m); } }; " ].join('');
			} },
		"/macro"  : { delta: -1, prefix: " return _OUT_arr.join(''); };" }
	}
	TrimPath.parseTemplate_etc.modifierDef = {
		"eat"		: function(v) {
			return "";
		},
		"escape"	 : function(s) {
			return String(s).replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
		},
		"capitalize" : function(s) {
			return String(s).toUpperCase();
		},
		"default"	: function(s, d) {
			return s != null ? s : d;
		}
	}
	TrimPath.parseTemplate_etc.modifierDef.h = TrimPath.parseTemplate_etc.modifierDef.escape;

	TrimPath.parseTemplate_etc.Template = function(tmplName, tmplContent, funcSrc, func, etc) {
		this.process = function(context, flags) {
			if (context == null)
				context = {};
			if (context._MODIFIERS == null)
				context._MODIFIERS = {};
			if (context.defined == null)
				context.defined = function(str) {
					return (context[str] != undefined);
				};
			for (var k in etc.modifierDef) {
				if (context._MODIFIERS[k] == null)
					context._MODIFIERS[k] = etc.modifierDef[k];
			}
			if (flags == null)
				flags = {};
			var resultArr = [];
			var resultOut = { write: function(m) {
				resultArr.push(m);
			} };
			try {
				func(resultOut, context, flags);
			} catch (e) {
				if (flags.throwExceptions == true)
					throw e;
				var result = new String(resultArr.join("") + "[ERROR: " + e.toString() + (e.message ? '; ' + e.message : '') + "]");
				result["exception"] = e;
				return result;
			}
			return resultArr.join("");
		}
		this.name = tmplName;
		this.source = tmplContent;
		this.sourceFunc = funcSrc;
		this.toString = function() {
			return "TrimPath.Template [" + tmplName + "]";
		}
	}
	TrimPath.parseTemplate_etc.ParseError = function(name, line, message) {
		this.name = name;
		this.line = line;
		this.message = message;
	}
	TrimPath.parseTemplate_etc.ParseError.prototype.toString = function() {
		return ("TrimPath template ParseError in " + this.name + ": line " + this.line + ", " + this.message);
	}

	var parse = function(body, tmplName, etc) {
		body = cleanWhiteSpace(body);
		var funcText = [ "var TrimPath_Template_TEMP = function(_OUT, _CONTEXT, _FLAGS) { with (_CONTEXT) {" ];
		var state = { stack: [], line: 1 };                              // TODO: Fix line number counting.
		var endStmtPrev = -1;
		while (endStmtPrev + 1 < body.length) {
			var begStmt = endStmtPrev;
			// Scan until we find some statement markup.
			begStmt = body.indexOf("{", begStmt + 1);
			while (begStmt >= 0) {
				var endStmt = body.indexOf('}', begStmt + 1);
				var stmt = body.substring(begStmt, endStmt);
				var blockrx = stmt.match(/^\{(cdata|minify|eval)/); // From B. Bittman, minify/eval/cdata implementation.
				if (blockrx) {
					var blockType = blockrx[1];
					var blockMarkerBeg = begStmt + blockType.length + 1;
					var blockMarkerEnd = body.indexOf('}', blockMarkerBeg);
					if (blockMarkerEnd >= 0) {
						var blockMarker;
						if (blockMarkerEnd - blockMarkerBeg <= 0) {
							blockMarker = "{/" + blockType + "}";
						} else {
							blockMarker = body.substring(blockMarkerBeg + 1, blockMarkerEnd);
						}

						var blockEnd = body.indexOf(blockMarker, blockMarkerEnd + 1);
						if (blockEnd >= 0) {
							emitSectionText(body.substring(endStmtPrev + 1, begStmt), funcText);

							var blockText = body.substring(blockMarkerEnd + 1, blockEnd);
							if (blockType == 'cdata') {
								emitText(blockText, funcText);
							} else if (blockType == 'minify') {
								emitText(scrubWhiteSpace(blockText), funcText);
							} else if (blockType == 'eval') {
								if (blockText != null && blockText.length > 0) // From B. Bittman, eval should not execute until process().
									funcText.push('_OUT.write( (function() { ' + blockText + ' })() );');
							}
							begStmt = endStmtPrev = blockEnd + blockMarker.length - 1;
						}
					}
				} else if (body.charAt(begStmt - 1) != '$' && // Not an expression or backslashed,
						   body.charAt(begStmt - 1) != '\\') {			  // so check if it is a statement tag.
					var offset = (body.charAt(begStmt + 1) == '/' ? 2 : 1); // Close tags offset of 2 skips '/'.
					// 10 is larger than maximum statement tag length.
					if (body.substring(begStmt + offset, begStmt + 10 + offset).search(TrimPath.parseTemplate_etc.statementTag) == 0)
						break;                                              // Found a match.
				}
				begStmt = body.indexOf("{", begStmt + 1);
			}
			if (begStmt < 0)							  // In "a{for}c", begStmt will be 1.
				break;
			var endStmt = body.indexOf("}", begStmt + 1); // In "a{for}c", endStmt will be 5.
			if (endStmt < 0)
				break;
			emitSectionText(body.substring(endStmtPrev + 1, begStmt), funcText);
			emitStatement(body.substring(begStmt, endStmt + 1), state, funcText, tmplName, etc);
			endStmtPrev = endStmt;
		}
		emitSectionText(body.substring(endStmtPrev + 1), funcText);
		if (state.stack.length != 0)
			throw new etc.ParseError(tmplName, state.line, "unclosed, unmatched statement(s): " + state.stack.join(","));
		funcText.push("}}; TrimPath_Template_TEMP");
		return funcText.join("");
	}

	var emitStatement = function(stmtStr, state, funcText, tmplName, etc) {
		var parts = stmtStr.slice(1, -1).split(' ');
		var stmt = etc.statementDef[parts[0]]; // Here, parts[0] == for/if/else/...
		if (stmt == null) {					// Not a real statement.
			emitSectionText(stmtStr, funcText);
			return;
		}
		if (stmt.delta < 0) {
			if (state.stack.length <= 0)
				throw new etc.ParseError(tmplName, state.line, "close tag does not match any previous statement: " + stmtStr);
			state.stack.pop();
		}
		if (stmt.delta > 0)
			state.stack.push(stmtStr);

		if (stmt.paramMin != null &&
			stmt.paramMin >= parts.length)
			throw new etc.ParseError(tmplName, state.line, "statement needs more parameters: " + stmtStr);
		if (stmt.prefixFunc != null)
			funcText.push(stmt.prefixFunc(parts, state, tmplName, etc));
		else
			funcText.push(stmt.prefix);
		if (stmt.suffix != null) {
			if (parts.length <= 1) {
				if (stmt.paramDefault != null)
					funcText.push(stmt.paramDefault);
			} else {
				for (var i = 1; i < parts.length; i++) {
					if (i > 1)
						funcText.push(' ');
					funcText.push(parts[i]);
				}
			}
			funcText.push(stmt.suffix);
		}
	}

	var emitSectionText = function(text, funcText) {
		if (text.length <= 0)
			return;
		var nlPrefix = 0;               // Index to first non-newline in prefix.
		var nlSuffix = text.length - 1; // Index to first non-space/tab in suffix.
		while (nlPrefix < text.length && (text.charAt(nlPrefix) == '\n'))
			nlPrefix++;
		while (nlSuffix >= 0 && (text.charAt(nlSuffix) == ' ' || text.charAt(nlSuffix) == '\t'))
			nlSuffix--;
		if (nlSuffix < nlPrefix)
			nlSuffix = nlPrefix;
		if (nlPrefix > 0) {
			funcText.push('if (_FLAGS.keepWhitespace == true) _OUT.write("');
			var s = text.substring(0, nlPrefix).replace('\n', '\\n'); // A macro IE fix from BJessen.
			if (s.charAt(s.length - 1) == '\n')
				s = s.substring(0, s.length - 1);
			funcText.push(s);
			funcText.push('");');
		}
		var lines = text.substring(nlPrefix, nlSuffix + 1).split('\n');
		for (var i = 0; i < lines.length; i++) {
			emitSectionTextLine(lines[i], funcText);
			if (i < lines.length - 1)
				funcText.push('_OUT.write("\\n");\n');
		}
		if (nlSuffix + 1 < text.length) {
			funcText.push('if (_FLAGS.keepWhitespace == true) _OUT.write("');
			var s = text.substring(nlSuffix + 1).replace('\n', '\\n');
			if (s.charAt(s.length - 1) == '\n')
				s = s.substring(0, s.length - 1);
			funcText.push(s);
			funcText.push('");');
		}
	}

	var emitSectionTextLine = function(line, funcText) {
		var endMarkPrev = '}';
		var endExprPrev = -1;
		while (endExprPrev + endMarkPrev.length < line.length) {
			var begMark = "${", endMark = "}";
			var begExpr = line.indexOf(begMark, endExprPrev + endMarkPrev.length); // In "a${b}c", begExpr == 1
			if (begExpr < 0)
				break;
			if (line.charAt(begExpr + 2) == '%') {
				begMark = "${%";
				endMark = "%}";
			}
			var endExpr = line.indexOf(endMark, begExpr + begMark.length);         // In "a${b}c", endExpr == 4;
			if (endExpr < 0)
				break;
			emitText(line.substring(endExprPrev + endMarkPrev.length, begExpr), funcText);
			// Example: exprs == 'firstName|default:"John Doe"|capitalize'.split('|')
			var exprArr = line.substring(begExpr + begMark.length, endExpr).replace(/\|\|/g, "#@@#").split('|');
			for (var k in exprArr) {
				if (exprArr[k].replace) // IE 5.x fix from Igor Poteryaev.
					exprArr[k] = exprArr[k].replace(/#@@#/g, '||');
			}
			funcText.push('_OUT.write(');
			emitExpression(exprArr, exprArr.length - 1, funcText);
			funcText.push(');');
			endExprPrev = endExpr;
			endMarkPrev = endMark;
		}
		emitText(line.substring(endExprPrev + endMarkPrev.length), funcText);
	}

	var emitText = function(text, funcText) {
		if (text == null ||
			text.length <= 0)
			return;
		text = text.replace(/\\/g, '\\\\');
		text = text.replace(/\n/g, '\\n');
		text = text.replace(/"/g, '\\"');
		funcText.push('_OUT.write("');
		funcText.push(text);
		funcText.push('");');
	}

	var emitExpression = function(exprArr, index, funcText) {
		// Ex: foo|a:x|b:y1,y2|c:z1,z2 is emitted as c(b(a(foo,x),y1,y2),z1,z2)
		var expr = exprArr[index]; // Ex: exprArr == [firstName,capitalize,default:"John Doe"]
		if (index <= 0) {		  // Ex: expr    == 'default:"John Doe"'
			funcText.push(expr);
			return;
		}
		var parts = expr.split(':');
		funcText.push('_MODIFIERS["');
		funcText.push(parts[0]); // The parts[0] is a modifier function name, like capitalize.
		funcText.push('"](');
		emitExpression(exprArr, index - 1, funcText);
		if (parts.length > 1) {
			funcText.push(',');
			funcText.push(parts[1]);
		}
		funcText.push(')');
	}

	var cleanWhiteSpace = function(result) {
		result = result.replace(/\t/g, "    ");
		result = result.replace(/\r\n/g, "\n");
		result = result.replace(/\r/g, "\n");
		result = result.replace(/^(\s*\S*(\s+\S+)*)\s*$/, '$1'); // Right trim by Igor Poteryaev.
		return result;
	}

	var scrubWhiteSpace = function(result) {
		result = result.replace(/^\s+/g, "");
		result = result.replace(/\s+$/g, "");
		result = result.replace(/\s+/g, " ");
		result = result.replace(/^(\s*\S*(\s+\S+)*)\s*$/, '$1'); // Right trim by Igor Poteryaev.
		return result;
	}

	// The DOM helper functions depend on DOM/DHTML, so they only work in a browser.
	// However, these are not considered core to the engine.
	//
	TrimPath.parseDOMTemplate = function(elementId, optDocument, optEtc) {
		if (optDocument == null)
			optDocument = document;
		var element = optDocument.getElementById(elementId);
		var content = element.value;     // Like textarea.value.
		if (content == null)
			content = element.innerHTML; // Like textarea.innerHTML.
		content = content.replace(/&lt;/g, "<").replace(/&gt;/g, ">");
		return TrimPath.parseTemplate(content, elementId, optEtc);
	}

	TrimPath.processDOMTemplate = function(elementId, context, optFlags, optDocument, optEtc) {
		return TrimPath.parseDOMTemplate(elementId, optDocument, optEtc).process(context, optFlags);
	}
})();
